DeweyDecimalSystem|Language

:400 Language

:401 Philosophy & theory

:402 Miscellany

:403 Dictionaries & encyclopedias

:404 Special topics

:405 Serial publications

:406 Organizations & management

:407 Education, research, related topics

:408 With respect to kinds of persons

:409 Geographical & persons treatment

:410 Linguistics

:411 Writing systems

:412 Etymology

:413 Dictionaries

:414 Phonology

:415 Structural systems (Grammar)

:417 Dialectology & historical linguistics

:418 Standard usage Applied linguistics

:419 Verbal language not spoken or written

:420 EnglishLanguage & Old English

:421 English writing system & phonology

:422 English etymology

:423 English dictionaries

:425 English grammar

:427 English language variations

:428 Standard English usage

:429 Old English (Anglo-Saxon)

:430 Germanic languages German language

:431 German writing system & phonology

:432 German etymology

:433 German dictionaries

:435 German grammar

:437 German language variations

:438 Standard German usage

:439 Other Germanic languages

:440 Romance languages French

:441 FrenchLanguage writing system & phonology

:442 French etymology

:443 French dictionaries

:445 French grammar

:447 French language variations

:448 Standard French usage

:449 Provencal & Catalan

:450 Italian, Romanian, Rhaeto-Romantic

:451 Italian writing system & phonology

:452 Italian etymology

:453 Italian dictionaries

:455 Italian grammar

:457 Italian language variations

:458 Standard Italian usage

:459 Romanian & Rhaeto-Romanic

:460 Spanish & Portugese languages

:461 Spanish writing system & phonology

:462 Spanish etymology

:463 Spanish dictionaries

:465 Spanish grammar

:467 Spanish language variations

:468 Standard Spanish usage

:469 Portugese

:470 Italic Latin

:471 Classical Latin writing & phonology

:472 Classical Latin etymology & phonology

:473 Classical Latin dictionaries

:475 Classical Latin grammar

:477 Old, Postclassical, Vulgar Latin

:478 Classical Latin usage

:479 Other Italic languages

:480 Hellenic languages Classical Greek

:481 Classical Greek writing & phonology

:482 Classical Greek etymology

:483 Classical Greek dictionaries

:485 Classical Greek grammar

:487 Preclassical & postclassical Greek

:488 Classical Greek usage

:489 Other Hellenic languages

:490 Other languages

:491 East Indo-European & Celtic languages

:492 Afro-Asiatic languages Semitic

:493 Non-Semitic Afro-Asiatic languages

:494 Ural-Altaic, Paleosiberian, Dravidian

:495 Languages of East & Southeast Asia

:496 African languages

:497 North American native languages

:498 South American native languages

:499 Miscellaneous languages